cob: Add patch::Action::EditRevision

To be able to change the description of a patch revision, without the
need to create a new revision.

Signed-off-by: Sebastian Martinez <me@sebastinez.dev>

radicle-httpd/src/api/v1/projects.rs

@@ -626,6 +626,12 @@ async fn patch_update_handler(
         } => {
             patch.edit(title, description, target, &signer)?;
         }
+        patch::Action::EditRevision {
+            revision,
+            description,
+        } => {
+            patch.edit_revision(revision, description, &signer)?;
+        }
         patch::Action::Tag { add, remove } => {
             patch.tag(add, remove, &signer)?;
         }